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United States Patent | 5,637,988 |
Gucyski | June 10, 1997 |
The switching power supply attains sinusoidal input current even at a low level of the input voltage. One capacitor is grounded and stores an intermediate voltage. One switch selectively applies the intermediate voltage to a node. A grounded diode is coupled to the node. An inductor is coupled to the node for attaining a current. Another switch selectively applies the current to the input terminal. A rectifier applies the current to the output terminal. Another capacitor is coupled between the output terminal and the one capacitor for storing and providing the output voltage.
Inventors: | Gucyski; Jeff (P.O. Box 11633, Costa Mesa, CA 92627) |
Appl. No.: | 486626 |
Filed: | June 7, 1995 |
Current U.S. Class: | 323/222; 323/225; 323/271 |
Intern'l Class: | H02M 003/155 |
Field of Search: | 323/222,223,224,225,268,271,272,351 363/89 |
3531712 | Sep., 1970 | Cecchini | 323/224. |
4242629 | Dec., 1980 | Shuey | 323/222. |
4521725 | Jun., 1985 | Phaneuf | 323/282. |
4618812 | Oct., 1986 | Kawakami | 323/224. |
4814685 | Mar., 1989 | Renger | 323/224. |
4949234 | Aug., 1990 | Gulezynski | 363/89. |
4956760 | Sep., 1990 | Gulczynski | 363/80. |
4999568 | Mar., 1991 | Gulczynski | 323/351. |
5006782 | Apr., 1991 | Pelly | 323/225. |
5038267 | Aug., 1991 | De Doncker et al. | 363/89. |
5057990 | Oct., 1991 | Gulczynski | 323/350. |
5146399 | Sep., 1992 | Gucyski | 363/89. |
5155430 | Oct., 1992 | Gulczynski | 323/224. |
5164656 | Nov., 1992 | Gulczynski | 323/222. |